Torque Control During Stop Ramp - ABB PSE 18 Installation And Commissioning Manual

Figure 7.16: Torque Control during stop
ramp parameter displayed
U
RPM
Figure 7.17: The function of Torque
Control during stop ramp

7.5.7 Torque Control during stop ramp

When activating this parameter (On) makes it possible to control the motor torque
during stop. Using torque control will result in a more suitable decelerating of the
speed mainly requested when stopping pumps.
When using torque control the output voltage to the motor is controlled so that
the motor torque will follow a predefined optimal curve for best possible stop. This
has the benefit that the mechanical stopping behavior of the equipment driven by
the motor will be much softer compared to using voltage ramp. This can be espe-
cially useful in pump applications where a sudden stop can cause water hammer-
ing and pressure surges. During the torque controlled stop the motors voltage
and RPM will follow the graphs in figure 7.17.
Display Default
value
OFF
The time for the Torque Control during stop ramp is set in the parameter Stop
Ramp time.
Softstarters Type PSE18...PSE370 Installation and commissioning manual 1SFC132057M0201
Setting Description
range
On/OFF Torque Control during stop ramp
Chapter 7 65